442 / 1173
Further example:
Standard treatment is 35 × 2 Gy to 70 Gy.
Initially the schedule is given in error as
1 Gy per fraction for the first 4 fractions
i.e.
the first 4 Gy is given “
hyper
fractionated”
Compensation:
70
−
4
=
66
70
×
2
−
4
×
1
70
−
4
=
2.0606...
66/20.0606…
=
32
fractions;
d
=
2.063 Gy